travis test

Author: hathach

.travis.yml

@@ -23,6 +23,7 @@ install:
   - arduino --install-boards adafruit:nrf52
   - ls $HOME/.arduino15/packages/adafruit/hardware
   - rm -r $HOME/.arduino15/packages/adafruit/hardware/nrf52
+  - echo $TRAVIS_BUILD_DIR
   - ln -s $TRAVIS_BUILD_DIR $HOME/.arduino15/packages/adafruit/hardware/nrf52
   - ls $HOME/.arduino15/packages/adafruit/hardware
   - arduino --install-library "Adafruit NeoPixel","Adafruit NeoMatrix","Adafruit GFX Library","Adafruit SSD1306","MIDI Library",